Hopefully a bearded dragon owner will get in touch with you, but in case they don't, this website might help - they mention temperature problems as one possible cause. If you scroll down a bit you will find it. There is also a forum called beardeddragon.org where you could get in touch with other owners.
My bearded dragon does the same its normal when it eats thrpugjt gets swollen but in a while it cools down and it inflates because it sucked in air so its all normal I hope this helped